limx→2(4x2-4-1x-2)=()A.-1B.-14C.14D.1-数学

题目简介

limx→2(4x2-4-1x-2)=()A.-1B.-14C.14D.1-数学

题目详情

lim
x→2
(
4
x2-4
-
1
x-2
)
=(  )
A.-1B.-
1
4
C.
1
4
D.1
题型:单选题难度:偏易来源:重庆

答案

lim
x→2
(class="stub"4
x2-4
-class="stub"1
x-2
)
=
lim
x→2
class="stub"2-x
(x2-4)
=
lim
x→2
class="stub"-1
x+2
=-class="stub"1
4

故选B.

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